Granted Patent
Utility
US 4,286,855 · App. 05/969,736
Electromagnetic releasing device
Inventor:
Hiroshi Hasegawa
Patented Case
View Patent ↗
Granted: Sep 1, 1981
Filed: Dec 15, 1978
Inventor
Hiroshi Hasegawa
Assignee (at issue)
Nippon Kogaku K.K.
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.